Clamp.



C. IRWIN.

CLAMP.

APPLICATION FILED MAR. 2o, 191s.

,SLYZm Patented Apr. 22, 1919.

WIM/Mv Copies of this patent may be obtained for ve cents each, by addressing the ashington, D. G.

i L l CHLES IRWIN, OF JEANNETTE, PENNSYLVANIA.

CLAMP.

To all whom t may concern.'

Be it known that I, CHARLES IRWIN, a citizen of the United States, residing at Jeannette, in the county of Westmoreland and State of Pennsylvania, have invented new and useful Improvements in Clamps, of which the following is a specification.

This invention relates to a clamp and has for its primary object to provide a clamp that may be readily associated with a boring machine table so as to clamp-work thereon in a more accurate manner than is the usual practice where clamping bolts are used.

An object of the invention is to provide substantial elements substantially connected together so as to stand rough usage to which a device of this character is subject.

A feature of my invention is the novel manner of forming the arm so that the same may be capable of engaging two sides of an object.

With these and other objects in view the invention will be better understood from the following detailed description taken in connection with the accompanying drawing wherein:

Figure l is a view showing my invention in applied position.

Fig. 2 is a perspective view of the arm. Fig. 3 is a detailed view showing the use of a clip so that one of the clamping devices may be dispensed with.

In a diagrammatic manner I show a portion of the boring machine table A upon which is mounted a cap B that is to be bored. Connected to the table at the proper points are a pair of brackets l and 2 but I wish it to be understood at this point at any suitable number of clamping devices may be used depending upon the shape of the o ject to be clamped. As both of the clamps are of identical construction the following description will be limited to one.

The bracket 1 has mounted therein a shaft 3 to which is rigidly connected a wheel 4c in the form of a ratchet wheel. This shaft 3 also has rigidly connected thereto one end of a bifurcated arm 57 the limbs 6 and 7 being of such a shape and length as to engage two sides of the cap as clearly shown in Fig. 1 of the drawing. Coperating with the teeth of the ratchet wheel is a leaf spring Specification of Letters Patent.

Application led March 20, 1918.

Serial No. 223,663.

8 of the required strength to hold the arm 5 in an operative position. Altho the leaf spring as the braki wish it to be understood that I sire to be limited to the exact showing as other suitable forms of braking elements may be used, the sole purpose being to hold the ratchet wheel against turning accidentally when the arm 5 is in applied position but allowing the arm and wheel to turn when excessive force is brought to bear by the operator upon the arm 5 for returni arm to an inoperative position.

the wheel is a rod 9 that passes through an apertured ear l0 formed integral with the bracket. The up- Pivotally connected to ward movement of the rod 9 is limite .tion is that the rotation of the ratchet wheel is limited so as to prevent the arm 5 from moving too far out of its operative position.

If found clamping devices may be with the exception of on shown in Fig. 3 substituted.

formation wit 14 secured to the table and the r portion relnectively embracing tw are of Z shape the cap From the foregoing description taken in connection with the accom itshould be apparent that ple device of substantial c Having described my invention what I claim is:

said bracket.

In testimony whereof I ax CHARL Patented Apr. 22, ilglli.

ugh I show ng element I do not de- Iig the advantageous in practice all dispensed with, and clips 13 These clips h one limb emainin o sides of panying drawing ents,

my signature. ES IRWIN.

Commissioner oi Patente. 

